Stool



FIG. 1 is a perspective view of a stool showing our new design;

FIG. 2 is a front elevational view thereof, the rear elevational viewthereof being identical;

FIG 3 is a right side elevational view thereof, the left sideelevational view thereof being identical;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof.

The ornamental design for a stool, substantially as shown and described.